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Earnings Per Common Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Common Share Earnings Per Common Share
Earnings per common share are calculated utilizing the two-class method. Basic earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding. Diluted earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding adjusted for the dilutive effect of common stock awards (outstanding stock options and unvested restricted stock awards) and common stock warrants. Presented below are the calculations for basic and diluted earnings per common share.
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(In Thousands, except per share data)
Net income
$
85,929

 
$
65,001

 
$
244,578

 
$
179,254

Preferred stock dividends
(2,409
)
 
(2,339
)
 
(7,077
)
 
(7,008
)
Net income available to common equity
$
83,521

 
$
62,662

 
$
237,501

 
$
172,246

Common shareholder dividends
(25,486
)
 
(18,149
)
 
(77,035
)
 
(54,726
)
Unvested share-based payment awards
(128
)
 
(105
)
 
(396
)
 
(332
)
Undistributed earnings
$
57,907

 
$
44,408

 
$
160,070

 
$
117,188

Undistributed earnings allocated to common shareholders
57,620

 
44,150

 
159,297

 
116,418

Undistributed earnings allocated to unvested share-based payment awards
288

 
258

 
772

 
770

Undistributed earnings
$
57,907

 
$
44,408

 
$
160,070

 
$
117,188

Basic
 
 
 
 
 
 
 
Distributed earnings to common shareholders
$
25,486

 
$
18,149

 
$
77,035

 
$
54,726

Undistributed earnings allocated to common shareholders
57,620

 
44,150

 
159,297

 
116,418

Total common shareholders earnings, basic
$
83,106

 
$
62,299

 
$
236,332

 
$
171,144

Diluted
 
 
 
 
 
 
 
Distributed earnings to common shareholders
$
25,486

 
$
18,149

 
$
77,035

 
$
54,726

Undistributed earnings allocated to common shareholders
57,620

 
44,150

 
159,297

 
116,418

Total common shareholders earnings, diluted
$
83,106

 
$
62,299

 
$
236,332

 
$
171,144

Weighted average common shares outstanding
170,516

 
150,565

 
168,249

 
150,983

Effect of dilutive common stock awards
2,188

 
1,815

 
2,101

 
2,081

Effect of dilutive common stock warrants
98

 
588

 
526

 
718

Diluted weighted average common shares outstanding
172,802

 
152,968

 
170,876

 
153,782

Basic earnings per common share
$
0.49

 
$
0.41

 
$
1.40

 
$
1.13

Diluted earnings per common share
$
0.48

 
$
0.41

 
$
1.38

 
$
1.11


Anti-dilutive common stock options of approximately 1.4 million and 1.0 million for the three months ended September 30, 2018 and 2017, respectively, and 1.4 million and 1.0 million for the nine months ended September 30, 2018 and 2017, respectively, were excluded from the earnings per common share calculation.